$\vec{RT} = (8 - 2,\ 11 - 7) = (6, 4)$

Magnitude: $\|\vec{RT}\| = \sqrt{6^2 + 4^2} = \sqrt{52} = 2\sqrt{13}$

Direction: $\tan^{-1}\!\left(\frac{4}{6}\right) = \tan^{-1}\!\left(\frac{2}{3}\right)$